Table 2.
Interobserver agreement and univariate correlation of variables for subarachnoid haemorrhage. Figures are percentages (numbers) unless stated otherwise
| Subarachnoid haemorrhage | P value | κ (n=103) | ||
|---|---|---|---|---|
| No (n=1869) | Yes (n=130) | |||
| Questions from history | ||||
| Mean age (years) | 42.6 | 54.4 | <0.001 | NA |
| Female | 60.6 (1133) | 56.9 (74) | 0.41 | NA |
| Mean time from onset to peak (minutes) | 9.2 | 3.4 | <0.002 | 0.47* |
| Mean pain severity at peak (0-10) | 8.6 | 9.3 | <0.001 | 0.70* |
| Onset during exertion | 10.7 (200) | 23.1 (30) | <0.001 | 0.61 |
| Onset during sexual activity | 6.0 (112) | 5.5 (7) | 0.79 | 0.85 |
| Headache awoke patient from sleep | 19.3 (361) | 10.8 (14) | 0.016 | 0.93 |
| Worst headache of life | 77.5 (1448) | 93.1 (121) | <0.001 | 0.45 |
| Loss of consciousness | 4.5 (84) | 16.9 (22) | <0.001 | 0.88 |
| Witnessed loss of consciousness | 2.5 (47) | 11.5 (15) | <0.001 | 1.0 |
| Needed to rest | 24.0 (449) | 43.9 (57) | <0.001 | 0.26 |
| Complaint of neck stiffness or pain | 30.9 (578) | 71.1 (92) | <0.001 | 0.65 |
| Vomiting | 26.3 (492) | 58.6 (76) | <0.001 | 0.80 |
| Ambulance | 16.7 (312) | 56.9 (74) | <0.001 | NA |
| Emergency department transfer | 7.9 (148) | 18.5 (24) | <0.001 | NA |
| Questions from physical examination | ||||
| Neck stiffness (flexion/extension) | 5.2 (97) | 30.4 (40) | <0.001 | 0.24 |
| Mean (SD) temperature (°C) | 36.4 (1.9) | 36.3 (1.5) | 0.39 | NA |
| Mean (SD) heart rate (beats/min) | 80.2 (15.5) | 79.0 (13.9) | 0.38 | NA |
| Mean (SD) systolic blood pressure (mm Hg) | 141 (24.1) | 159 (29.3) | <0.001 | NA |
| Mean (SD) diastolic blood pressure (mm Hg) | 81 (13.4) | 88 (13.9) | <0.001 | NA |
NA=not applicable.
*Spearman’s interclass correlation coefficient.